I just found this strange thing called Tick in Cellar level. Its stay on player head but it also shown to the top-left side of the screen. What's its purpose (I died next room without being able to see any effects)?

2 Answers
2

Prevents Player from changing his/her Trinket, unless they have Mom's Purse. In return, reduces the health of all bosses by what appears to be 10-15%. (This also affects bosses encountered at random through normal rooms)